161911227458 has 6 divisors (see below), whose sum is σ = 242867694771. Its totient is φ = 80955329202.

The previous prime is 161911227427. The next prime is 161911227503. The reversal of 161911227458 is 854722119161.

It can be written as a sum of positive squares in only one way, i.e., 80955613729 + 80955613729 = 284527^2 + 284527^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=284527.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 426791 + ... + 711317.

Almost surely, 2^161911227458 is an apocalyptic number.

161911227458 is a deficient number, since it is larger than the sum of its proper divisors (80956467313).

161911227458 is an frugal number, since it uses more digits than its factorization.

161911227458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569056 (or 284529 counting only the distinct ones).

The product of its digits is 241920, while the sum is 47.

The spelling of 161911227458 in words is "one hundred sixty-one billion, nine hundred eleven million, two hundred twenty-seven thousand, four hundred fifty-eight".